254 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



longer in female (43 : 27) ; proportions of antenna! segments 9:7:11:7 

 (male), 11:8:15:9 (female). Rostrum attaining hind border of head. 



Pronotum trapezoidal, shorter than wide across humeri (cf, 26:53; 

 9, 29 : 61) ; forelobe much narrower than hind lobe ( cf , 46 : 53, 9, 51 :61). 

 Collum slender, granulate. Anterolateral angles regularly rounded, 

 crenulate, slightly expanded, but not protruding either forward or 

 sideways. Lateral borders of forelobe slightly diverging backward. 

 Interlobal notch feebly marked; depression distinct but not very deep. 

 Foredisc with four (2+2) granulate ridges equally developed. Lateral 

 borders of hind lobe diverging backward, feebly rounded. Hind disc 

 with dense setigerous granulation. 



Scutellmn shorter than basal width (cf, 23:26; 9, 25:30), rounded 

 at apex; all margins rimmed, median ridge flattened. 



Hemelytra reaching to foreborder of tergum VII; apical angle of 

 corium rounded, apical border feebly rounded. 



Abdomen ovate, longer than wide (cf , 75:65), maximal width across 

 segment IV. Connexiva with postero-exterior angles barely protrud- 

 ing, those of connexivum VII rounded, reaching to middle of hypo- 

 pygium. Hypopygium subcordate, with rather broad, tapering 

 apically, median ridge, latter becoming slightly elevated posteriorly. 

 Lobes of VIII clavate, reaching to distal thu'd of hypopygimn. Fe- 

 male abdomen more rounded laterally; lobes of VIII rounded, reaching 

 to middle of IX, IX deeply excavated apicaUy. All spiracles ventral, 

 placed far from lateral border. 



Color. — Head, pronotum, scuteUum, and median ridge of hypopyg- 

 ium ferrugineous to dark ferrugineous, mottled with yellow-brown; 

 connexivmn and rest of hypopygium yellow-brown. Exterior borders 

 of connexiva bicolored, piceous, and yellow; membrane brown, 

 becoming yellow-brown at base. 



Measurements. — Length: male, 5.00 mm.; female, 5.86 mm. 

 Width of pronotum: male, 1.76; female, 2.03 mm. Width of abdo- 

 men: male, 2.16 mm.; female, 2.50 mm. 



HoLOTYPE.^ — Male, Guaratuba, D. F. Brazil, collected by Aristo- 

 teles Silva, June 30, 1940, deposited in Instituto "Oswaldo Cruz," 

 Rio de Janeiro, Brazil. 



Allotype. — Female, Horqueta, Paraguay, collected by Alberto 

 Schulze, 1938, in Drake Collection (USNM). 



Paratype. — Female, taken with allotype, in collection of author. 



Remarks.— It is a pleasure to dedicate this species to Prof. Dr. 

 Angelo da Costa Lima, who kindly lent me the male for classification. 



M. costalimai is allied to M. eurycephala Kormilev, but it differs 

 from the latter by the following characteristics: much smaller; head 

 narrower; postocular tubercles only slightly passing outer margin of 

 eyes; connexivum bicolored. 



